Paper and process of making same.



Patented Nov. 26, IQDI. J. C. SCHMIDT & R. A. G.'AULT.

PAPER AND PROCESS OF MAKING SAME.

(Application filed Mar. 24, 1900.)

(No Model.)

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UNITED STATES PATENT OFFICE.

JOHN C. SCHMIDT AND ROBERT A. G. AULT, OF YORK, PENNSYLVANIA.

PAPER AND PROCESS OF MAKING SAME.

SPECIFICATION forming part of Letters Patent No. 687,580, dated November 26, 1901.

Application filed March 24, 1900. Serial No. 10,077. (No specimens.)

To all whom it may concern.- Be it known that we, JOHN G. SCHMIDT and ROBERT A. G. AULT, citizens of the United States, residing at York, in the county of York and State of Pennsylvania,have invented certain new and useful Improvements in Paper and Processes of Making the Same; andwe do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawing, forming a part of this specification, and to the letters of reference marked thereon.

Thisinvention relates to an improved paper adapted for carpet-linings, packing material, (as, for instance, to prevent the breaking of fragile articles,) &c.,and to an improved process of forming the same.

The objects of the invention are to produce a material having a highly-elastic body well calculated to afford a perfect cushion and which will not become set under continued pressure or lifeless by long usage, a further object of the invention being to manufacture a material for the purposes specified by a simple cheap process not requiring the expensive and accurately-adjusted mechanism such as has heretofore been necessary.

The improved article itself is characterized by a relatively heavy body of paper fiber irregularly crinkled throughout and having indentations, forming projections on one side andcorrespondin g depressions on the opposite side, such indentations interrupting the continuity of the crinkles and constituting portions having a practically permanent indented conformation or which tend normally to return to the indented form instead of tending to return to the original plane of the body of the paper, as is the case with plain indented paper now in use. Desirable results are secured by a process of manufacture which involves, first,the formation of a crinkled body,whereby surplus stock is gathered into the crinkles, and, secondly, the indenting of the crinkled body,whereby the indentations wholly or partially absorb or take up the surplus material in that portion of the body from which the indentations are formed. The indentations are formed without reducing the thickness-of the stock at any point, but rather by a reformation of such portions of the stock or a straightening out wholly or partially of the crinkles in such portion of the stock and the absorption of the surplus stock in the form of indentations, which will tend to return to their indented form even after having been forced back into the plane of the body of the stock by external pressure, such as occurs in use. Indentationsin plain smooth stock can only be made by stretching, and consequently reducing the thickness of,the stock at the points of indentation, from which it results that the indentations can only be of slight-depth. The rolls for forming the indentations have to be accurately formed and carefully adjusted to prevent the breaking of the stock at thecrest of the indentations, and under the most favorable circumstances the indentations are of less strength than the body of the stock and being formed by straining the stock have a tendency to return to the plane of the body of the material. Thus they have but a short lift and slight permanent resiliency.

The present invention overcomes these difficulties, for, as before explained, the indentations simply change the form of the stock without strain on the fiber, and the crinkles being irregular it can never return to the crinkled form, and therefore to flatten down must either condense and thicken the stock or spread the body, the resultant being a highly elastic material having a natural tendency to retain its indented form. Furthermore, in the formation of the indentations they may be made very deep or high and the rolls need neither be very accurate nor finely adjusted, for there is little danger of breaking the stock in the indentations because of the surplus material always present in the crinkles ready to be taken upin the indentations.

In the accompanying drawing a section of the improved paper is shown in perspective.

The letter A indicates the body of the paper crinkled irregularly throughout, and B indicates the indentations formed up in the body of the stock by means of rolls or other suitable appliances. The body of the stock is first formed with the crinkles throughout, and subsequently the indentations are formed therein. Obviously the indentations may be made of any desired shape, and hence while diamond-shaped indentations are illustrated we do not wish to be limited thereto.

paper of the character specified, consisting 'in forming a crinkled body and subsequently forming indentations in said body; substantially as described.

JOHN C. SCHMIDT. ROBERT A. G. AULT.

Witnesses:

J. G. M. BROWN, W. S. OWEN. 

